linux-kernel - Re: [PATCH v3 01/28] xhci: Add support to allocate several interrupters

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Date:   Thu, 09 Mar 2023 11:51:18 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Wesley Cheng <quic_wcheng@...cinc.com>
Cc:     <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <agross@...nel.org>,
        <Thinh.Nguyen@...opsys.com>, <bgoswami@...cinc.com>,
        <andersson@...nel.org>, <robh+dt@...nel.org>,
        <gregkh@...uxfoundation.org>, <tiwai@...e.com>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_jackp@...cinc.com>,
        <quic_plai@...cinc.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH v3 01/28] xhci: Add support to allocate several interrupters

On Thu, 09 Mar 2023 00:57:24 +0100,
Wesley Cheng wrote:
> +struct xhci_interrupter *
> +xhci_create_secondary_interrupter(struct usb_hcd *hcd, int intr_num)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	struct xhci_interrupter *ir;
> +	unsigned int i;
> +	unsigned int idx = 0;
> +	unsigned long flags;
> +
> +	if (!xhci->interrupters || intr_num > xhci->max_interrupters)
> +		return NULL;
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
....
> +	if (idx > 0) {
> +		ir = xhci_alloc_interrupter(xhci, idx, GFP_KERNEL);
> +		if (!ir) {
> +			spin_unlock_irqrestore(&xhci->lock, flags);
> +			return NULL;
> +		}
> +		ir->intr_num = idx;
> +		xhci->interrupters[idx] = ir;
> +		spin_unlock_irqrestore(&xhci->lock, flags);

You can't use GFP_KERNEL allocation inside the spinlock.


Takashi